408 on Spray
408 on Spray I have a low cr(9:1) 408 in my Silverado and want to know how much I can safely spray and what my timing should be.
It has the following.
9:1 compression
AFR 225's
224/231 .595/.595 114
I started with a 50 shot and quickly moved to a 100. I recently went to a 150 but I think I am at the limit of the stock fuel pump. I will be getting a dual pump kit from Lonnie's but it is mostly for the turbos going in.
In the meantime how much can I safely spray on pump 91 California gas? Being that it is a low cr engine do I still have to pull 2* per 50 of timing?
I can run 109 or C16 but I want to see how much I can run with pump gas so when I am on the street I know if I can flip the switch or not.
It has the following.
9:1 compression
AFR 225's
224/231 .595/.595 114
I started with a 50 shot and quickly moved to a 100. I recently went to a 150 but I think I am at the limit of the stock fuel pump. I will be getting a dual pump kit from Lonnie's but it is mostly for the turbos going in.
In the meantime how much can I safely spray on pump 91 California gas? Being that it is a low cr engine do I still have to pull 2* per 50 of timing?
I can run 109 or C16 but I want to see how much I can run with pump gas so when I am on the street I know if I can flip the switch or not.
If you are on a stock pump I got to imagine that the 150 is pushing the limits.
The best way to start, is conservative, pull 4-6 for the 150 shot. See how everything is going and add timing if you can. Especialy since you are running a 408 there isn't much if any data on your set up so you need take safe baby steps and build it into the beast it will become.
The best way to start, is conservative, pull 4-6 for the 150 shot. See how everything is going and add timing if you can. Especialy since you are running a 408 there isn't much if any data on your set up so you need take safe baby steps and build it into the beast it will become.
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I would pull 7-8* on the 150. But I would not spray any more than you are on the stock pump with a 408.
What does the tune look like now tho? Is it an NA tune for the 91?
If you do not now the answer to some of the questions you ask ( Not a knock, Its a good thing you asked here ) you definitely need to take it slow. Also if you have a tuner, keep him involved in this. I am sure he has more knowledge on the combo and your driving habits.
What does the tune look like now tho? Is it an NA tune for the 91?
If you do not now the answer to some of the questions you ask ( Not a knock, Its a good thing you asked here ) you definitely need to take it slow. Also if you have a tuner, keep him involved in this. I am sure he has more knowledge on the combo and your driving habits.
If you are on a stock pump I got to imagine that the 150 is pushing the limits.
The best way to start, is conservative, pull 4-6 for the 150 shot. See how everything is going and add timing if you can. Especialy since you are running a 408 there isn't much if any data on your set up so you need take safe baby steps and build it into the beast it will become.
The best way to start, is conservative, pull 4-6 for the 150 shot. See how everything is going and add timing if you can. Especialy since you are running a 408 there isn't much if any data on your set up so you need take safe baby steps and build it into the beast it will become.
I would pull 7-8* on the 150. But I would not spray any more than you are on the stock pump with a 408.
What does the tune look like now tho? Is it an NA tune for the 91?
If you do not now the answer to some of the questions you ask ( Not a knock, Its a good thing you asked here ) you definitely need to take it slow. Also if you have a tuner, keep him involved in this. I am sure he has more knowledge on the combo and your driving habits.
What does the tune look like now tho? Is it an NA tune for the 91?
If you do not now the answer to some of the questions you ask ( Not a knock, Its a good thing you asked here ) you definitely need to take it slow. Also if you have a tuner, keep him involved in this. I am sure he has more knowledge on the combo and your driving habits.
I switch tunes when I want to spray and my timing is about 23* NA then I have been taking away 2(50 shot), 4(100 shot) and 6(150). For the track I splash a little 109 in the tank but I want to make sure it is safe without it. That is just for peace of mind at the track since it has been really hot and I am hammering it and hot lapping it a lot.
